WO2020077715A1

WO2020077715A1 - Display device

Info

Publication number: WO2020077715A1
Application number: PCT/CN2018/115542
Authority: WO
Inventors: 宋月龙
Original assignee: 武汉华星光电半导体显示技术有限公司
Priority date: 2018-10-17
Filing date: 2018-11-15
Publication date: 2020-04-23
Also published as: CN109377878A

Abstract

Disclosed is a display device, comprising a display panel (10) and a flexible substrate (20). The flexible substrate (20) defines a bending area (22), the bending area (22) comprises a first layer (21) and a second layer (23) arranged one above the other, and when the bending area (22) is bent, the first layer (21) is located at an outer layer, and the second layer (23) is located at an inner layer of the first layer (21). The first layer (21) is provided therein with a first metal wire (212) of a first shape, and the second layer (23) is provided therein with a second metal wire (232) of a second shape; and the length of the first metal wire (212) is greater than that of the second metal wire (232). The flexible substrate (20) has a new double-layer metal wire shape structure design, thereby effectively reducing the intensity of stress applied to the metal wire in the outer layer of the bending area, thereby resulting in balanced stress on the metal wires in the inner layer and the outer layer of the bending area (22), and further resulting in consistent stability of the metal wires.

Description

Display device

Technical field

The invention relates to the technical field of flat display, in particular, one of the display devices.

Background technique

It is known that liquid crystal display screens or OLED display screens have been widely used and generally accepted by the market due to their advantages such as lightness, thinness, and good display effect.

With the development of mobile phones towards high screen ratio and high resolution, the narrow border design of the display screen has become a trend in the development of mobile phone structures. In this regard, the Pad Bending technology commonly used in the industry to achieve this narrow border design.

For example, please refer to FIG. 4, which illustrates a common pad bending structure in a display device. A metal line 102 is provided on the flexible substrate 100 to electrically connect the display panel 110 and the PCB board 120. Among them, the common metal wire in the industry is a single-layer design or a double-layer design; when a double-layer design is adopted, the two layers of metal wires have the same shape.

As shown in the bending area of the circle in the figure, the bending degree of the outer layer metal wire is greater than that of the inner layer metal wire due to the certain bending degree in the bending zone, and because of the The upper and lower double-layer metal wires are designed with the same shape and length, which makes the bending strength of the metal wire in the outer layer greater than the bending strength of the inner metal wire, which makes it suffer from The force is greater than the inner metal wire.

This differential stress situation will make the metal wire in the outer layer of the double-layer metal wire more inferior to the inner layer metal wire due to the larger force. Further, this difference in the stability of the metal wire will affect the stability of the subsequent display products to a certain extent. It is easy to cause the outer metal wire to be partially broken due to excessive bending, while the inner metal wire also Stable connection.

Therefore, it is indeed necessary to develop a new type of display device to overcome the defects in the prior art.

technical problem

One aspect of the present invention is to provide a display device whose flexible substrate adopts a brand-new double-layer metal wire structure design, which effectively improves the strength of the stress on the metal wire in the outer bending region, thereby making the bending region The inner and outer metal wires in the middle are balanced in force, which makes the stability of the two more consistent.

Technical solution

The technical scheme adopted by the present invention is as follows:

A display device includes a display panel and a flexible substrate. Wherein the display panel is provided with a first pad and a second pad, and the flexible substrate defines a bending area, wherein the bending area includes a first layer and a first insulating layer arranged above and below The second layer, when the bending region is bent, the first layer is in the outer layer, and the second layer is in the inner layer of the first layer. Wherein the first layer is provided with a first metal wire in a first shape for electrically connecting the first pad; the second layer is provided with a second metal wire in a second shape for Electrically connect the second pad; and the length of the first metal wire after straightening is greater than the length of the second metal wire after straightening.

In the present invention, the metal wires of different layers in the bending area are designed with different lengths, so that the first metal wire in the outer layer can effectively compensate for the bending of the flexible substrate bending area due to the lengthened design. It is on the outside and needs to be increased in length. In this way, it can be ensured that both the first metal wire and the second metal wire can maintain approximately the same degree of stretch, thereby making the stability of the two consistent, so that there is no reason for the first metal wire and the first metal wire The bimetallic wires are of the same length and have the problem of poor stability caused by excessive stretching.

Further, the lengthened design of the first metal wire may be implemented by adopting a different shape design from the second metal wire; or the same shape but different shape parameters involved.

Specifically, in different embodiments, the first shape of the first metal wire includes one or a combination of two or more shapes in a curve, a bending line, a wavy line, or these non-straight lines Shape lines can also be combined with straight lines to form a combined shape line.

Wherein, the second shape of the second metal wire includes one or a combination of two or more types of shapes of curved lines, bent lines, and wavy lines, or these non-straight line shapes can also be combined with straight lines to form one Combine shape lines.

As for which shape line or shape line combination is selected for the first metal wire and the second metal wire, it can be determined according to actual needs, and is not limited, as long as the shape of the two is different, and the length of the first metal wire It may be longer than the length of the second metal wire.

Further, in different embodiments, wherein the first shape of the first metal wire and the second shape of the second metal wire may be the same shape, but the specific shape parameters used are different, so that the first metal wire Is longer than the second metal wire.

For example, in one embodiment, wherein the first shape of the first metal wire and the second shape of the second metal wire are both bent shapes, but the bending angle of the first shape is smaller than the second shape The bending angle of is such that the straightened length of the first metal wire is longer than the straightened length of the second metal wire.

In yet another embodiment, wherein the first shape of the first metal wire and the second shape of the second metal wire are both curved shapes, but the curvature of the first shape is greater than the curvature of the second shape In this way, the straightened length of the first metal wire is longer than the straightened length of the second metal wire.

In yet another embodiment, wherein the first shape of the first metal wire and the second shape of the second metal wire are both wavy wire shapes, but the crest of the wavy wire of the first shape is greater than the second shape The peak of the wavy line is such that the straightened length of the first metal wire is longer than the straightened length of the second metal wire.

Further, in different embodiments, the first shape of the first metal wire is different from the second shape of the second metal wire.

Further, in different embodiments, the bending region of the flexible substrate further includes a second insulating layer and a third layer disposed under the second layer, and a third shape is disposed in the third layer A third metal wire, wherein the length of the third metal wire is less than the length of the second metal wire.

The third shape of the third metal wire includes one or a combination of two or more shapes among curved lines, bent lines, and wavy lines, or these non-straight line shapes can also be combined with straight lines to form a Combine shape lines.

Further, in different embodiments, the first pad and the second pad provided on the display panel are in the same layer.

Beneficial effect

The present invention relates to a display device which adopts different length designs for the metal wires of different layers in the bending area of its flexible substrate, so that the first metal wire in the outer layer when the bending area is bent, because The lengthened design can effectively compensate for the increased length required on the outside. In this way, it is ensured that both the first metal wire and the second metal wire can maintain approximately the same degree of stretching when being bent, thereby making the stability of the two consistent, so that there is no reason for the first metal wire The same length as the second metal wire causes a problem of being stretched excessively.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions in the embodiments of the present invention, the drawings required in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without paying any creative work, other drawings can also be obtained based on these drawings.

1 is a schematic structural diagram of a display device according to an embodiment of the present invention, wherein the flexible substrate includes metal lines in a first layer and a second layer, for clear display, the second layer above the second layer An insulating layer and the first layer are not shown;

2 is a schematic structural diagram of a display device according to another embodiment of the present invention, wherein the flexible substrate includes metal lines in the first layer and the second layer, for clear display, the second layer above The first insulating layer and the first layer are not shown;

FIG. 3 is a schematic structural diagram of a display device provided by still another embodiment of the present invention, wherein the metal lines in the first layer and the second layer included in the flexible substrate are shown clearly for The first insulating layer and the first layer are not shown;

4 is a schematic structural diagram of a display device involved in the prior art.

Best Mode of the Invention

The technical solution of a display device according to the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Referring to FIG. 1, an embodiment of the present invention provides a display device, including a display panel 10 and a flexible substrate 20.

The display panel is provided with a first pad 11 and a second pad 13, wherein the first pad 11 and the second pad 13 are provided in the same layer, but are not limited thereto. The flexible substrate 20 includes a first layer 21, a first insulating layer (not shown) and a second layer 23 disposed above and below, wherein a first metal line 212 with a first shape is disposed in the first layer 21, Used to electrically connect the first pad 11 and the PCB board (not shown); the second layer 23 is provided with a second metal wire 232 in a second shape for electrically connecting the second A pad 13 and a PCB board (not shown), wherein the first insulating layer is used to separate the first layer 21 and the second layer 23.

Further, a bending area 22 is defined on the flexible substrate 20 (the marked area in the figure is only an exemplary illustration, which is not actually limited to this area range). When the bending area 22 is bent, the The first layer 21 is an outer layer, and the second layer 23 is an inner layer of the first layer 21.

In this embodiment, the first shape of the first metal wire 212 is a bent shape, and the shape of the second metal wire 232 is also a bent shape, but the bending angle of the first shape is less than The bending angle of the second shape makes the length of the first metal wire 212 after straightening longer than the length of the second metal wire 232, so that the first metal wire is bent in the bending area At this time, although the second metal wire on the outer side and the inner side is relatively overstretched, but because its length is longer than the second metal wire, its increased length can effectively compensate for the increased length required on the outer side, In this way, it can be ensured that both the first metal wire and the second metal wire can maintain approximately the same degree of stretch, thereby making the stability of the two consistent, so that there is no reason for the first metal wire and the first metal wire The problem is that the two metal wires have the same length and are stretched excessively.

Further, please refer to FIG. 2, which illustrates a display device provided by still another embodiment of the present invention, including a display panel 10 and a flexible substrate 20.

In this embodiment, it differs from the embodiment shown in FIG. 1 only in that the first shape of the first metal wire 212 is a curved shape, and the second shape of the second metal wire 232 is also a curved shape, but The bending curvature of the first shape is greater than the bending curvature of the second shape, thereby ensuring that the length of the first metal wire in the bending region 22 is greater than the length of the second metal wire.

Further, please refer to FIG. 3, which illustrates a display device provided by still another embodiment of the present invention, including a display panel 10 and a flexible substrate 20.

In this embodiment, it differs from the embodiment shown in FIG. 1 only in that the first shape of the first metal wire 212 is wavy, and the second shape of the second metal wire 232 is also wavy, but The peak-to-peak value of the first shape is greater than the peak-to-peak value of the second shape, thereby ensuring that the length of the first metal wire in the bending region 22 is greater than the length of the second metal wire.

In the embodiments disclosed above, the first metal wire and the second metal wire involved in the present invention respectively adopt the same shape, but differ in specific shape parameters, thereby ensuring that the bending area 22 The length of the first metal wire 212 is longer than the length of the second metal wire 232.

In other embodiments, the first shape of the first metal wire 212 may be different from the second shape of the second metal wire 232 as long as the first shape in the bending region 22 is ensured The length of the metal wire may be longer than the length of the second metal wire. The specific shapes of the first shape and the second shape used by the first metal line 212 and the second metal line 232 may be determined according to specific needs and are not limited.

The present invention relates to a display device which adopts different length designs for the metal wires of different layers in the bending area of its flexible substrate, so that the first metal wire in the outer layer when the bending area is bent, because The lengthened design can effectively compensate for the increased length required on the outside. In this way, it is ensured that both the first metal wire and the second metal wire can maintain a substantially uniform degree of stretch, thereby making the stability of the two consistent, so that there is no reason for the first metal wire and the first metal wire The problem is that the two metal wires have the same length and are stretched excessively.

The technical scope of the present invention is not limited to the content in the above description. Those skilled in the art can make various modifications and modifications to the above-mentioned embodiments without departing from the technical idea of the present invention, and these modifications and modifications should belong to Within the scope of the invention.

Claims

A display device includes a display panel and a flexible substrate; wherein the display panel is provided with a first pad and a second pad, and the flexible substrate defines a bending area, wherein the bending area includes upper and lower The first layer, the first insulating layer and the second layer, when the bending region is bent, the first layer is in the outer layer, and the second layer is in the inner layer of the first layer;

Wherein the first layer is provided with a first metal wire in a first shape for electrically connecting the first pad; the second layer is provided with a second metal wire in a second shape for For electrically connecting the second pad, the length of the first metal wire after straightening is greater than the length of the second metal wire after straightening.
A display device according to claim 1, wherein the first shape of the first metal line includes one or a combination of two or more shapes among curved lines, bent lines, and wavy lines.
A display device according to claim 1, wherein the second shape of the second metal wire includes one or a combination of two or more shapes among curved lines, bent lines, and wavy lines.
A display device according to claim 1, wherein the first shape is different from the second shape.
A display device according to claim 1, wherein the first shape of the first metal wire and the second shape of the second metal wire are both bent shapes, but the bending angle of the first shape is smaller than The bending angle of the second shape makes the length of the first metal wire after straightening longer than the length of the second metal wire after straightening.
A display device according to claim 1, wherein the first shape of the first metal wire and the second shape of the second metal wire are both curved shapes, but the curvature of the first shape is greater than the first The curvature of the two shapes is such that the straightened length of the first metal wire is longer than the straightened length of the second metal wire
A display device according to claim 1, wherein the first shape of the first metal line and the second shape of the second metal line are both wavy line shapes, but the peak of the wavy line of the first shape is greater than The peak of the wave line of the second shape is such that the straightened length of the first metal wire is longer than the straightened length of the second metal wire.
A display device according to claim 1, wherein the bending region of the flexible substrate further includes a second insulating layer and a third layer disposed under the second layer, the third layer is provided with a third A third-shaped third metal wire, wherein the length of the third metal wire is smaller than the length of the second metal wire.
A display device according to claim 8, wherein the third shape of the third metal wire includes one or a combination of two or more shapes among curved lines, bent lines, and wavy lines.
A display device according to claim 1, wherein the first pad and the second pad provided on the display panel are in the same layer.